Normal Mode Initialization of the RPN Finite Element Model

Abstract

The technique of nonlinear normal mode initialization is applied to a limited area model by interpolating initialized fields obtained from a hemispheric spectral model. The vertical structure of the two models is identical and topography and physical parameterization are common to both models. Results show that the procedure successfully transfers the properties of nonlinear normal mode initialization from the spectral model to the regional model. There are also indications that if we impose differences in vertical structure between the forecast and the initialization models, these have only minor effects on the time evolution.